PET-PEG共聚物及其纤维的制备及性能研究  

Preparation and properties of PET-PEG copolymers and fibers

作　　者：吉鹏[1] 刘红飞[1] 王朝生[1] 陈向玲[1] 王华平[1] 

机构地区：[1]东华大学材料科学与工程学院纤维材料改性国家重点实验室,上海201620

出　　处：《合成纤维工业》2015年第1期1-6,共6页China Synthetic Fiber Industry

基　　金：国家科技支撑计划项目(2011BAE05B01)

摘　　要：通过共聚反应合成了含不同相对分子质量聚乙二醇（PEG）及其添加量的聚对苯二甲酸乙二醇酯（PET）-PEG嵌段共聚物，经熔融纺丝制备PET—PEG共聚酯纤维。利用核磁共振氢谱、差示扫描量热分析、X射线衍射（XRD）等手段对共聚酯的结构及其热性能进行了表征。结果表明：核磁共振氢谱证实了共聚酯为PET—PEG目标产物；随着PEG相对分子质量从800增加到6000，PET—PEG共聚酯的熔融温度从243．97℃增加到253．55℃，冷却结晶温度从176．32℃增加到189．25℃，表面接触角从74．2°下降到62．3°，共聚酯纤维在标准环境下的回潮率从0．51％增加到0．68％；在PEG相对分子质量为2000时，添加PEG相对对苯二甲酸（PTA）质量分数为0～20％时，共聚酯的熔融温度与冷却结晶温度随着PEG添加量的增加呈下降趋势，共聚酯纤维的回潮率呈指数增加；PEG添加量相对PTA质量分数为20％时，共聚酯可纺性较差；XRD表明PEG在结晶过程中并不进入PET晶格中，为了保证共聚酯的良好吸湿性能和力学性能，PET—PEG的共聚合反应时，PEG适宜的相对分子质量为2000，添加量相对PTA的质量分数为10％。The block copolyesters of polyethylene terephthalate-polyethylene glycol （PET-PEG） with different amounts of PET with different relative molecular mass were synthesized by copolymerization reaction and were spun into PET-PEG copolyester fibers by melt spinning process. The structure and thermal properties of the copolyesters were characterized by nuclear magnetic resonance, differential scanning Calorimetry and X-ray diffraction analysis （XRD）. The results showed that PET-PEG copolyester was proved to be the target product by nuclear magnetic resonance; the PET-PEG copolyester had the melting temperature increasing from 243.97 ℃ to 253.55 ℃ ,the cold crystal!ization temperature increasing from 176.32 ℃ to 189.25 ℃ and the surface contact angle decreasing from 74.2° to 62.3°and the copolyester fibers had the moisture regain increasing from 0.51% to 0. 68% under standard environment when the relative molecular mass of PEG was increased from 800 to 6 000; the melting temperature and cold crystallization temperature of the copolyesters appeared a downward tendency and the moisture regain of the copolyester fibers showed an exponential increase with the addition of PEG with the relative molecular mass of 2 000 from 0 to 20 % by mass fraction based on purified terephthalic acid （PTA） ; the spinnability of the copolyesters was poor as the mass fraction of PEG was 20% based on PTA ; PEG did not enter the crystal lattice of PET during the crystallization process ; and the relative molecular mass of PEG should be 2 000 and the addition of PEG should be 10% by mass fraction based on PTA in order to acquire the favorable moisture absorption and mechanical properties of the copolyesters during the copolymerization reaction of PET-PEG.

关 键 词：聚对苯二甲酸乙二醇酯 聚乙二醇 热性能 吸湿性能 微相分离 结构 

分 类 号：TQ342.2[化学工程—化纤工业]